[ltt-dev] [PATCH 7/9] add identical-hash-value-chain test

[laijs@cn.fujitsu.com (Lai Jiangshan)]

Signed-off-by: Lai Jiangshan <laijs at cn.fujitsu.com>
---
 tests/test_urcu_hash.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/tests/test_urcu_hash.c b/tests/test_urcu_hash.c
index eb42522..3730c2b 100644
--- a/tests/test_urcu_hash.c
+++ b/tests/test_urcu_hash.c
@@ -111,6 +111,7 @@ struct test_data {
 struct lfht_test_node {
 	struct cds_lfht_node node;
 	unsigned long hash;
+	unsigned long orig_hash;
 	/* cache-cold for iteration */
 	struct rcu_head head;
 };
@@ -142,6 +143,7 @@ static unsigned long init_populate;
 static int opt_auto_resize;
 static int add_only, add_unique, add_replace;
 static int opt_test_bucket_conflict;
+static int opt_duplicated;
 
 static int count_pipe[2];
 
@@ -395,6 +397,19 @@ void lfht_test_node_init(struct lfht_test_node *node)
 
 	cds_lfht_node_init(&node->node);
 
+	/* 25% duplicated hash value */
+	if (opt_duplicated && test_rand_get_bits(2) == 0) {
+		struct cds_lfht_iter iter;
+
+		if (!cds_lfht_lookup(test_ht, test_rand_get(),
+				lookup_first, NULL, &iter))
+			cds_lfht_next(test_ht, &iter);
+		if (iter.node)
+			hash = to_test_node(iter.node)->orig_hash;
+	}
+
+	node->orig_hash = hash;
+
 	if (opt_test_bucket_conflict) {
 #if (CAA_BITS_PER_LONG == 32)
 		int hash_bits= test_rand_get_bits(5);
@@ -690,6 +705,7 @@ void show_usage(int argc, char **argv)
 	printf("        [-k nr_nodes] Number of nodes to insert initially.\n");
 	printf("        [-A] Automatically resize hash table.\n");
 	printf("	[-C] Use some hash value Confilict with buckets.\n");
+	printf("	[-D] Test Duplicated hash values and nodes.\n");
 	printf("\n\n");
 }
 
@@ -810,6 +826,8 @@ int main(int argc, char **argv)
 			break;
 		case 'C':
 			opt_test_bucket_conflict = 1;
+		case 'D':
+			opt_duplicated = 1;
 			break;
 
 		}
-- 
1.7.4.4